Quantifying Mercury Use and Modeling Its Fate and Transport in Artisanal and Small-Scale Gold Mining in the Lom Basin

Strategic Insights -

A recent study published in the journal Hydrology has shed light on the use and transport of mercury in artisanal and small-scale gold mining (ASGM) activities in the Lom River basin in Cameroon. The research, conducted by a team of scientists from the University of Yaounde 1, aimed to quantify mercury use and model its fate and transport in the region. The study revealed that mercury use in ASGM activities ranged from 2250 to 7500 kg during intense mining periods, with industrial discharges dominating mercury pollution during the dry season and leaching from mining surfaces being the primary contributor during the rainy season.

Key Takeaways:

  • Mercury concentrations from mining surfaces were estimated using a soil input function approach, indicating that volatilization has a more significant impact on predicted mercury concentrations than photodissociation.
  • Three scenarios were modeled for mercury use: whole ore amalgamation (WOA), combined whole and concentrate ore amalgamation (WOA + COA), and concentrate ore amalgamation (COA).
  • The study concluded that mercury use estimates ranged from 2250-7500 kg during intense activity to 1260-4200 kg during high water for the gold production of 750 and 525 kg, respectively.
  • Industrial discharges dominated mercury pollution during the dry season, while leaching from mining surfaces was the primary contributor during the rainy season.
  • The research highlights the need for more effective management of mercury use in ASGM activities to mitigate its impacts on the environment and human health.
  • The study's findings have important implications for the development of policies and regulations to reduce mercury pollution in the Lom River basin and other regions where ASGM activities are prevalent.

Statistics:

  • Mercury use estimates ranged from 2250 to 7500 kg during intense mining periods.
  • Gold production of 750 kg was associated with 2250-7500 kg of mercury use.
  • Gold production of 525 kg was associated with 1260-4200 kg of mercury use.
  • Industrial discharges dominated mercury pollution during the dry season (75-90%).
  • Leaching from mining surfaces was the primary contributor to mercury pollution during the rainy season (50-60%).

Sources:

  • Quantifying Mercury Use and Modeling Its Fate and Transport in Artisanal and Small-Scale Gold Mining in the Lom Basin. Hydrology, 2025, 12(4):77. (Hydrology - http://www.mdpi.com/journal/hydrology).
  • MDPI AG.